Portable compressor and means for mounting the same on tractors



Sept. 24, 1929. J. A. DAVEY ET AL 1,729,155

PORTABLE COMPRESSOR AND MEANS .FOR MOUNTING THE SAME 0N TRACTORS '4 Filed May 27, 1927 4 Sheets-Sheet l I iLEau' fcuw Ilka/6% Charms L. 6mg r,

gmentoifi 4 Sept. 24, 1929- J. A. DAVEY ET AL 1,729,155

PORTABLE COMPRESSOR AND MEANS FOR MOUNTING THE SAME ON TRACTORS Filed May 27, 1927 45heets-Sheet 2 Sept. 24, 1929- J. A. DAVEY ET AL 1,729,155

PORTABLE COMPRESSOB AND MEANS FOR MOUNTING THE SAME 0N TRACTORS Filed May 27, 1927 4 Sheets Sheet 5 gwuemtors JwnesAlfiavqy. Zaul H. Dewey. Charles 1 Gan ger,

- alitozmq Sept. 24, 1929. J. A. DAVEY ET AL 1,729,155

PORTABLE COMPRESSOR AND MEANS FOR MOUNTING 'IjHE SAME 0N TRACTORS Filed May 27, 1927 4 Sheets-Sheet 4 IlII|Illllllllllllllllllllllll' l I|IIIlll|ll|I||llIIIl|lllllllllllllllllllllll J wsA.,Dau@ Pau/Z/ E ,Dave y, CharlesLGaugler;

Patented Sept. 24, 1929 UNITEDQ'STTATES' PATENT OFFICE JAMES A. DAVEY, OF SOUND BEACH, CONNECTICUT, AND PAUL. H. DAVEY AND CHARLES L. GAUGLER, OF KENT, OHIO;;SAID GAUGLER ASSIGNOR TO THE DAVEY TREE EXPERT GO.,' OF KENT, OHIO, A CORPORATION OF OHIO PORTABLE COMPRESSOR AND MEANS FOR MOUNTING THE SAME 01v zr AcrroEs Application filed May 27, 1927. Serial No. 194,704.

Our said invent-ion relates to a portable compressor and means for mounting the same on a tractor, which may be of the Fordson type. It is a matter of great convenience and economy to be able to mount a compressor on a power generator which cantravel from place to place under its own power and which is itself inexpensive and of light weight. It

is an object of our invention to provide a compressor which is itself light and of simple construction, but which is of large capacity, with means for attaching it to a tractor.

This application is in part, a continuation of our application erial No. 703,098, filed March 81, 1924. i

Another object is rto provide improved meansfor readily connecting the compressor drivingmeans to a driven shaft of the tractor.

Referring to the drawings, which are made a part of this application, and in which similar parts are indicated by similar reference characters: I

Fig. 1, is a side elevation of aFordson tractor with the compressor of our invention 1 applied thereto,

Fig. 2, avertical longitudinal'section of a part of the compressor, I I

Fig. 8, a vertical section of the compressor, Fig. 1, a crosssection illustrating a pre:

3 ferred means of connecting the driving means of the compressor and the tractor.

Fig. 5, an elevation of apart of the compressor, viewed from the right in Fig. 1, and Figs. 6' to 9, details. of parts shown in 5 Figs. 4 and 5.

In the drawings, reference character 10 indicates generally a tractor of the type re-- ferred to, said tractor having an opening in the side of the crank case for attachment of abelt pulley or the like in well-known man- 1 the tractor, e. g., the main shaft extending lengthwise thereof. vA clutch (not shown) serves to disconnect the compressor when the tractor is to be moved. a I In the embodiment here pressor has a crankshaft 11 with a crank pin shown the com- 12 connected to pitman rods 13 which actuate pistons 14 in the cylinders 15 at opposite ends of the compressor crank casing 16.

'inade of aluminum or other metal havinga high heat conductivity and provided with cooling fins 20. As best shown in Figure 2,

' each reservoir is directly connected to its correspondmg cylinder and the cooling fins 20 together with cooling fins .18 on the cylinder proper are effective for maintaining the entire apparatus at the desired low temperature.

Each reservoir 19 is provided with an opening in line with the cylinder 15 and adapted to receive a basket-like frame member 21 for supporting the inlet and outlet valves of the cylinder. The frame member 21-comprises a central tube 22 having inwardly projecting lugs 23 for supporting a cross bar 2 1. A bolt 25 passes through the cross bar and is threaded into a valve seat 26"having inlet ports 27 therein. Avalve 28 is normally held against the seat 26 by springs 29 whichare carried by a spider 30. On the inlet stroke of the piston l lair passes through the central tube 22 past the cross bar 2 1 and through the openings 27 into the cylinder. On the return stroke the air is compressed and leaves the cylinder through openings 31 in the valve seat 26, past a valve 32 normally held against the seat by springs 83, and into the reservoir 19. hen the compressed air is discharged into the reservoir it spreads outwardly and impinges on the walls thereof. This greatly facilitates cooling and aids materially in maintaining the compressor atthe desired low temperature,due to the high heat conductivity of the reservoir, and of the valve seat 26, preferably made of aluminum.

The basket frame 21 is held in place by cap screws 31 and when these are removed the en-. tire valve structure, as well as the interior of the cylinder and thereservoir, is immediately accessible. The basket and the valve structure are removable as a whole from the compressor and the inlet valve may be replaced by removing a screw 35 which holds the spider 30 in place, while the outlet valve may be replaced by loosening the bolts 25, turning the cross bar until it is free of the lugs 23 and removing the valve plate 26 from the basket frame 21.

The reservoirs 19 are connected by a conduit 3G and air may be withdrawn from the compressor through a connection 37 which is preferably provided with a relief valve. The conduit 36 is tireierably large, since this allows a very rapid communication of pressures between the reservoirs. As will be apparent from the drawings, the two cylinders alternately discharge compressed air and the conduit 36 serves as an equalizer for the compressor. Ordinarily it will be found that the two reservoirs will be ample for any use to which the compressor may be put and air may be taken from the connection 37 directly to the air driven tool. In some cases it may be desir-able to interpose an additional reservoir in the system and this can be readily accomplished. In any event, the )IOVlSlOll of a reservoir immediately adjacent the cylinder is of value, particularly in a portable compressor of this type, which it is proposed to operate at high speeds with air cooling.

A pair of fans 39 and it) may be mounted on pivots 41, 42 projecting from the reservoirs 19 and may be driven by a belt i3 passing over a pulley ii on the shaft 11, these ians serving to further cool the. reservoirs.

In the construction shown in Figs. 4 to 9 a part of the crank case is indicated at 47 with an opening to receive a sleeve 48 having a flange it) secured to the crank case by screws 50. The attachment plate or supporting plate 51 for the compressor housing has a cylind rical extension 51 slidably mounted in sleeve 18 and has a bronze bushing 58 providing a bearing for the shaft 5% of the compressor, which shaft carries abevel gcar 55l1aving teeth engaging those of a gear 56 of the main shaft 57 of the tractor. A ball bearing is interposed between the gear and a shoulder on the supporting plate. A second bronze bushing is located between the shaft 5i and the housing 52, said bushing being sep arated from bushing 53 by a washer 60 resting against a shoulder on the supporting plate.

Adjacent parts of the sleeve i8 and the extension on the supporting plate 51 are reversely threaded and a ratchet 61 has threads engaging the threads of parts 48 and 51 for moving the plate 51, the compressor and the shaft 54 axially of said shaft to bring the gear 55 into or out of engagement with the gear 56. A lever 62 for operating the ratchet is formed at its lower end with a cavity, closed by a plate 63, in which a pawl 6i is movably supported, said pawl being held in engagement with the ratchet by a spring 65. The pawl at its lower end is beveled, as shown in Fig. 5, so as to slip over the ratchet teeth in one direction.

Splines 66 (Fig. 5) engage corresponding grooves 67 and ($8 in parts 48 and 51 (Figs. 8 and 7) to prevent rotation of the extension 51 and parts attached thereto. Except as noted the compressor of Fig. i may be as in our application Serial No. 15,717 filed March 16, 1925.

It will be evident from the foregoing that when the tractor is to be moved the lever is moved in a direction to turn the ratchet so as to back otf the compressor, the plate 51, extension 51, shaft 54, and gear 55 away from gear 56. lVhen the compressor is to be used the pawl is turned to cause it to move the ratchet in the opposite sense and the operation is repeated in reverse order to bring the gears into engagement.

It will be obvious to those skilled in the art that the device of our invention can be changed in various respects without departing from the spirit of the invention and therefore we do not limit ourselves to the particular mechanisms shown in the drawings and described in the specification but only as indicated in the appended claims. For example, it is within the contemplation of my invention to attach the compressor to a. truck or other motor vehicle in the manner indicated. Having thus fully described our said invention, what we claim and desire to secure by Letters Patent is:

l. The combination of an engine-driven tractor, a portable compressor carried there-- by said compressor being of a capacity requiring substantially the entire power of the engine, and means for moving the compressor bodily toward and away from the tractor to bring it into and out of driving engagement with a shaft of the tractor.

2. The combination of a tractor having a driving shaft, a portable compressor carried by the tractor, and means for moving the compressor bodily toward and away from the tractor to bring it into and out of driving engagement with said driving shaft, said means comprising reversely arranged threads on adjacent cylindrical parts of the tractor and the compresor, an annular member having internal threads engaging the first-named threads, and means to rotate said annular member.

3. The combination of a tractor having a driving shaft, :1 portable compressor carried by the tractor, said compresor having a shaft, and means for moving the compressor bodily toward and away from the tractor to bring its shaft into and out of driving engagement with said driving shaft, said means comprising reversely arranged threads on adjacent cylindrical parts of the tractor and the compressor, an annular ratchet having internal threads engaging the first-named threads, and means to rotate said ratchet.

4. A device as in claim 3, said last-named means including a reversible pawl.

5. The combination of a tractor having a driving shaft, a portable compressor carried by the tractor, a sleeve secured to the crank e case of the tractor, an extension on the housing of the compressor sp'li'ned to said sleeve, and means to move the compressor bodily toward and away from the tractor to bring it into and out of driving engagement with said driving shaft.

6. The combination of an engine-driven tractor having a driving shaft, a compressor of a capacity requiring substantially the entire power ofthe engine for driving it, said compressor having a shaft driven from said engine shaft, a pair of alined cylinders parallel to the longitudinal axis of the tractor and arranged at opposite sidesof the compressor shaft, and pistons in said cylinders driven by said compressor shaft.

7. The combination of an engine-driven tractor having a driving shaft, a portable compressor of a size requiring substantially the entire power of the engine for driving it mounted at one side of the tractor in a position normally provided on standard tractors of this type for, a power take-off, said compressor having a shaft extending horizontally outward from the tractor, and means for connecting said shaft of the compressor to said driving shaft.

v 8. The combination of an engine-driven tractor having a driving shaft, a portable compressor of a size requiring substantially the entire power of the engine for driving it mounted at one side of the tractorrin a position normally provided. on standard tractors of this type for a power take-off, said compressor having a shaft extending horizontally outward from the tractor, means for connecting said shaft of the compressor to said driving shaft, and manually operable means to connect said shafts. i

9. The combination of an engine-driven tractor having a driving shaft, a portable compressor of a size requiring substantially the entire power of the engine for driving it mounted at one side of the tractor in a position normally provided on standard-tractors of this type for a power take-off, said comv pressor having a shaft extending horizontally outward from the tractor, means for connecting said shaft of the compressor to said driving shaft, gears on said shafts, and manual means to engage said gears directly with each other. v

In testimony whereof we affix our signatunes. 7

JAMES A. DAVEY.

PAUL H. DAVEY. CHARLES L. GAUGLER. 

